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<p>This paper presents a detailed description of a model-independent method for the direct measurement of the Υ(4<i>S</i>) → <i>B</i><sup>+</sup><i>B</i><sup>−</sup> and Υ(4<i>S</i>) → <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <msup> <mi>B</mi> <mn>0</mn> </msup> <msup> <mover accent="true"> <mi>B</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> </math></EquationSource> <EquationSource Format="TEX">\( {B}^0{\overline{B}}^0 \)</EquationSource> </InlineEquation> production fractions at <i>B</i> factories. The method is based on counting single- and double-inclusive charmed meson production at the Υ(4<i>S</i>) resonance, providing statistical tagging of <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <msup> <mi>B</mi> <mn>0</mn> </msup> <msup> <mover accent="true"> <mi>B</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> </math></EquationSource> <EquationSource Format="TEX">\( {B}^0{\overline{B}}^0 \)</EquationSource> </InlineEquation> and <i>B</i><sup>+</sup><i>B</i><sup>−</sup> events. A feasibility study indicates that a precision comparable to the current world average can be achieved without making any underlying assumptions, as the calculations rely solely on event yields.</p>

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A model independent method for measurement of B± and B0 meson production fractions at Υ(4S)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月17日

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  • M. Yasaveev,
  • P. Pakhlov,
  • N. Peters,
  • A. Mufazalova

摘要

This paper presents a detailed description of a model-independent method for the direct measurement of the Υ(4S) → B+B− and Υ(4S) → B 0 B ¯ 0 \( {B}^0{\overline{B}}^0 \) production fractions at B factories. The method is based on counting single- and double-inclusive charmed meson production at the Υ(4S) resonance, providing statistical tagging of B 0 B ¯ 0 \( {B}^0{\overline{B}}^0 \) and B+B− events. A feasibility study indicates that a precision comparable to the current world average can be achieved without making any underlying assumptions, as the calculations rely solely on event yields.